reliable?  I guess that means delivers on time.

You have to call them to make sure they have parts on hand.  Then they are reliable.  Otherwise, most will take up to 2 weeks.

remove tank, don't need to but remove carb, remove top support, get manual, read tech section post, print pict of head cover, poke bolts in it as you remove them, curse cause you just twisted a head off of one, order replacement, get manual cause I don't remember the rest.

Make sure you match up what you need with a picture of it.  The names we use don't always match what they call it.  If you order a tensioner, you get the rear guide.  order the guide you get the front guide and you can't replace that unless you take off the head.  I'd order the tensioner, adjuster and chain for sure.  since you're ordering, clutch gasket whether you replace it or not.  And you might consider ordering a few of the bolts for the head cover cause you might twist off one or two, I did.  And won't be your fault.  bolts are either damaged durring install or over time, not sure.